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authorHans Verkuil <hans.verkuil@cisco.com>2012-04-27 13:28:34 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-05-07 15:29:10 -0300
commit77cf393434898d1299c77c32bdd0629b2b4df170 (patch)
tree1cb16fbe4201817a90b44215142edaaa21f28154 /drivers/media/radio
parent85578b0fdc107e0d7022d38271fdcf0567afd212 (diff)
downloadop-kernel-dev-77cf393434898d1299c77c32bdd0629b2b4df170.zip
op-kernel-dev-77cf393434898d1299c77c32bdd0629b2b4df170.tar.gz
[media] radio-mr800: add support for stereo and signal detection
Thanks to an older driver by Faidon Liambotis <paravoid@debian.org> (as noted in the radio-mr800 comment block at the start) for figuring out how to get the signal/stereo state. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/radio')
-rw-r--r--drivers/media/radio/radio-mr800.c43
1 files changed, 38 insertions, 5 deletions
diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 0a96eda..0b39a8c 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -103,6 +103,7 @@ devices, that would be 76 and 91. */
* List isn't full and will be updated with implementation of new functions
*/
#define AMRADIO_SET_FREQ 0xa4
+#define AMRADIO_GET_SIGNAL 0xa7
#define AMRADIO_SET_MUTE 0xab
#define AMRADIO_SET_MONO 0xae
@@ -236,6 +237,35 @@ static int amradio_set_stereo(struct amradio_device *radio, char argument)
return 0;
}
+static int amradio_get_stat(struct amradio_device *radio, bool *is_stereo, u32 *signal)
+{
+ int retval;
+ int size;
+
+ radio->buffer[0] = 0x00;
+ radio->buffer[1] = 0x55;
+ radio->buffer[2] = 0xaa;
+ radio->buffer[3] = 0x00;
+ radio->buffer[4] = AMRADIO_GET_SIGNAL;
+ radio->buffer[5] = 0x00;
+ radio->buffer[6] = 0x00;
+ radio->buffer[7] = 0x08;
+
+ retval = usb_bulk_msg(radio->usbdev, usb_sndbulkpipe(radio->usbdev, 0x02),
+ radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
+ if (!retval)
+ retval = usb_bulk_msg(radio->usbdev, usb_rcvbulkpipe(radio->usbdev, 0x81),
+ radio->buffer, BUFFER_LENGTH, &size, USB_TIMEOUT);
+
+ if (retval || size != BUFFER_LENGTH) {
+ amradio_dev_warn(&radio->vdev.dev, "get stat failed\n");
+ return retval;
+ }
+ *is_stereo = radio->buffer[2] >> 7;
+ *signal = (radio->buffer[3] & 0xf0) << 8;
+ return 0;
+}
+
/* Handle unplugging the device.
* We call video_unregister_device in any case.
* The last function called in this procedure is
@@ -272,20 +302,23 @@ static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct amradio_device *radio = video_drvdata(file);
+ bool is_stereo = false;
+ int retval;
if (v->index > 0)
return -EINVAL;
+ v->signal = 0;
+ retval = amradio_get_stat(radio, &is_stereo, &v->signal);
+ if (retval)
+ return retval;
+
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = FREQ_MIN * FREQ_MUL;
v->rangehigh = FREQ_MAX * FREQ_MUL;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
- /* We do not know how to get hold of the stereo indicator, so
- all we can do is give back both mono and stereo, which
- effectively means that we don't know. */
- v->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
- v->signal = 0xffff;
+ v->rxsubchans = is_stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
v->audmode = radio->stereo ?
V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
return 0;
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